I can not identify the exact model of this transistor. enter image description here It reacts as a bipolar NPN Si transistor with EBC pin configuration (first image left to right,) not ECB! This seems to be made by Siemens. Package is TO92.

Any idea?

It's from old store, just found plenty ot them ~500pcs. I did successful test: middle to left p-n junction ~0.6V; middle to right p-n junction ~0.6V; also LED test -ok. Аlso the diode glimmers at base current through the fingers. schematic

I think these transistors were prepared for mounting and then abandoned due to the unusual configuration of the pins. You can see the cut pins of the exact length. It's kind of like a rare coin.enter image description here

  • 2
    \$\begingroup\$ +1 for great quality photo's. If only everybody would provide images that good. By the way, you are right: that is a Siemens logo. \$\endgroup\$
    – Oldfart
    Apr 3, 2020 at 12:16
  • \$\begingroup\$ Could it be a SIEMENS BF420? datasheetspdf.com/pdf/126135/SiemensSemiconductorGroup/BF420/1 \$\endgroup\$ Apr 3, 2020 at 12:22
  • \$\begingroup\$ @Verbal Kint: Might be but pinout is EBC not ECB... -??? \$\endgroup\$
    – Peter MP
    Apr 3, 2020 at 12:30
  • \$\begingroup\$ Also made by ON semi and former Philips. \$\endgroup\$
    – Andy aka
    Apr 3, 2020 at 12:33
  • 1
    \$\begingroup\$ Where does this transistor come from? I assume you probe the pinout with a multimeter in \$V_f\$ mode? \$\endgroup\$ Apr 3, 2020 at 13:08


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